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Abstract

Tubular printed circuit armature 1 is supported at one end by a plastic disc 2 having four thin-walled, radially extending arms 3 which connect the disc to motor shaft 4. The motor shaft is positioned in plastic end bell 5 by bearings 6 and 7 and by spring 8. The disc includes an optical mask 9 of an optical tachometer. The optical tachometer includes light source 10 and photocell 11. The end bell 5 also holds two 90 degrees paced brushes 12.

Country

United States

Language

English (United States)

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Low Inertia High Torque Printed Circuit Motor

Tubular printed circuit armature 1 is supported at one end
by a plastic disc 2 having four thin-walled, radially extending arms
3 which connect the disc to motor shaft 4. The motor shaft is
positioned in plastic end bell 5 by bearings 6 and 7 and by spring 8.
The disc includes an optical mask 9 of an optical tachometer. The
optical tachometer includes light source 10 and photocell 11. The
end bell 5 also holds two 90 degrees paced brushes 12.

The central housing of the motor is an open-ended magnetic material cylinder
13 and a central rod in the form of a four-pole magnet 14 whose poles are 90
degrees spaced.

A second plastic end bell 15 includes an internal, central located post 16 and
a recessed annular well 17 which surrounds the post. When end bell 15 is
molded, it is removed from the mold and while still hot it is slipped over the end of
cylinder 13. When the end bell cools, it shrinks and is mounted on the end of the
cylinder.

A washer of Bi-staged epoxy is placed in position on post 16. magnet 14 is
then positioned with a cylindrical spacer, not shown, surrounding the magnet to
define motor air gap 18. The magnet is mechanically held in place, by a bolt
which extends through the central opening in the magnet and an opening in the
end bell. The structure is then heated to cure the epoxy and mount the magnet
on the end bell. After heating, the air gap spacer is removed. The magnet is
now mechanically mounted, bot...